Detection of high humidity by optical fibre sensing at telecommunications wavelengths

D. C. Bownass, J. S. Barton, J. D C Jones

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


We demonstrate the proof of principle for a novel fibre optic sensor for the detection of high humidity. The device uses single-mode fibre at telecommunications wavelengths, making it particularly suitable for application in passive optical networks. The sensing mechanism relies on a humidity-induced refractive index change in an organic film coated onto the cladding of a bent fibre. The sensor was shown to respond at relative humidities > 62% and > 80% using gelatine and polyethylene oxide films respectively, by the onset of a strong interaction between the LP01 mode and a whispering gallery mode. © 1998 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)90-94
Number of pages5
JournalOptics Communications
Issue number1-6
Publication statusPublished - 15 Jan 1998


  • Fibre-optic sensors
  • Humidity detection
  • Network monitoring
  • Telecommunications
  • Whispering gallery interaction


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